JPH0443831Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a rotation regulating device for a wheel train mechanism that temporarily restricts and stops the rotational movement of a wheel train mechanism in an analog timepiece.

[Technical background of the invention and its problems]

Generally, in electronic analog timepieces such as wristwatches, the second hand is stopped by pulling out the winding stem to a predetermined position, and the minute and hour hands are set by rotating the winding stem in this state. Conventionally, the means for stopping the second hand is to rotate a mandarin lever by pulling out the winding stem, rotate a stop lever in conjunction with this mandrel, and connect the tip of the stop lever to the intermediate wheel (gear of the wheel train mechanism). It is brought into contact with the tips of the teeth on the periphery, and the frictional force generated by this contact restricts the rotation of the intermediate wheel and stops the second hand.

Incidentally, in recent years, from the viewpoint of reducing production costs, it has become common for most of the gears in the wheel train mechanism, including the intermediate wheel, to be made of plastic. However, when the intermediate wheel is made of plastic and the stop lever is brought into contact with the tips of the teeth on the peripheral edge of the intermediate wheel, the tips of the teeth are easily deformed or damaged by the impact. Deformation and damage to the stop lever can be prevented to some extent by weakening the contact force of the stop lever, but in such a case, the rotation regulation function of the intermediate wheel will be reduced, making it difficult to stop the second hand accurately. .

On the other hand, in a configuration in which the rotation of the intermediate wheel is restricted by rotating the stop lever, a special shaft is required to serve as the rotation fulcrum of the stop lever, and
A large planar space must be secured for the rotation, which increases the number of parts, complicates assembly, and increases the size of the wheel train mechanism.
Furthermore, since the contact force of the stop lever is applied in a direction perpendicular to the axis of the intermediate wheel, there is a problem in that the axis of the intermediate wheel is deflected, which adversely affects the smooth rotation transmission operation of the wheel train mechanism. It was hot.

[Purpose of invention]

This invention was made with attention to these points, and its purpose is to accurately regulate the rotation of the gear without deforming or damaging the rotation regulating gear, and to reduce the number of parts. It is an object of the present invention to provide a rotation regulating device for a wheel train mechanism which is capable of reducing the number of wheels and is miniaturized, and which does not impair the smoothness of the rotation transmission operation of the wheel train mechanism.

[Summary of the idea]

In order to achieve such an objective, this invention includes a stop lever that is movable along the axial direction of the gear of the gear train mechanism, and is formed by a fixed part fixed to the main plate and extending from the main plate surface at a predetermined distance. It consists of an open part, a stepped part bent toward the main plate surface, a sliding contact part extended along the main plate surface, and a stop part bent toward the receiving direction. When one end of the rotating member between the open part and the main plate pulls out the winding stem, it climbs over the stepped part of the stop lever and inserts between the sliding part and the main plate, thereby moving the sliding part to the specified gear side. The stop portion is moved so that the tip of the stop portion comes into contact with the side surface of a convex portion or a concave portion of a predetermined gear, thereby regulating the rotation of the predetermined gear.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 10.

Figures 4 and 5 show the movement 1 of a wristwatch.
The movement 1 is a bottom view of the movement, and is made of a synthetic resin base plate 2, on which a step motor 3, a gear train mechanism 4, a changeover correction mechanism 5, a battery 6, etc. are mounted. The step motor 3 drives the hour and minute hands,
The driving source for the second hand is the coil 8 and the stator 9.
and a rotor 10, which rotates stepwise by half a turn based on the magnetic field generated in the coil 8.

The train wheel mechanism 4 is provided between the base plate 2 and a train wheel bridge 11 made of synthetic resin and placed opposite thereto. That is, as shown in FIG. 6, an opening 13 is formed in the base plate 2, and a metal center tube 14 is press-fitted into this opening 13. The center tube 14 is composed of a disc part 15 facing inside the opening 13 and a cylindrical part 16 projecting upward from the center of the disc part 15. An hour wheel 17 is provided on the upper side of the center tube 14, and the hour wheel 17 consists of a pointer tube 18 and a gear 19. mated to,
A gear 19 is slidably supported on the upper surface of the center tube 14.

The second wheel 20 is located on the lower side of the center tube 14.
The second gear 20 consists of the second gear 21 and the second pinion 22, and the second gear 21 is the second pinion 2.
2 via a slip mechanism 23.
Further, the second pinion 22 has a pointer tube 24 integrally,
This pointer tube 24 is the cylindrical portion 1 of the center tube 14.
It is inserted concentrically and rotatably through the inner periphery of 6 and protrudes above it. A fourth wheel & pinion 25 is disposed below the second wheel & pinion 20, and this fourth wheel & pinion 25 is supported by the train wheel bridge 11 and integrally has a pointer shaft 26. 20 pointer tube 2
It is rotatably inserted through the inside of 4 and protrudes above it. Further, a third wheel 27, an intermediate wheel 28, and a rotor 10 of the step motor 3 are rotatably supported between the main plate 2 and the train wheel bridge 11. Then, the third gear 30 of the third wheel 27 is connected to the fourth pinion 31 of the fourth wheel 25, the third pinion 32 of the third wheel 27 is connected to the second gear 21 of the second wheel 20, and the third pinion 32 is connected to the second pinion 21 of the second wheel & pinion 20.
The fourth gear 33 of No. 5 is the intermediate pinion 34 of the intermediate wheel 28.
, the intermediate gears 36 of the intermediate wheel 28 mesh with the rotor pinion 12 of the rotor 10, and the second wheel & pinion 2
The second pinion 22 of 0 and the gear 19 of the hour wheel 17 are connected via a minute wheel 35. Also, hour wheel 1
7, the hour hand 37 is at the upper end of the pointer tube 18, and the center wheel 20
A minute hand 38 is attached to the upper end of the pointer barrel 24, and a second hand 39 is attached to the upper end of the pointer shaft 26 of the fourth wheel & pinion 25 by press fitting. The third wheel 27, the fourth wheel 25, and the intermediate wheel 28 are integrally formed of, for example, a plastic made of polyacetal mixed with reduced potassium titanate whiskers as a reinforcing material.
Also, the second gear 21 of the second wheel 20 and the second pinion 2
2 are each made of metal.

Therefore, the operation of the step motor 3, that is, the step rotation operation of the rotor 10, is transmitted to the fourth wheel & pinion 25 via the intermediate wheel 28, and this fourth wheel & pinion 25
9 and rotates at a speed of 3600 r.ph. The rotational movement of the fourth wheel & pinion 25 is transmitted to the center wheel & pinion 20 via the third wheel & pinion 27, and the center wheel & pinion 20 rotates together with the minute hand 38 at a speed of 1 r.ph. Furthermore, the rotational movement of the center wheel 20 is transmitted to the hour wheel 17 via the minute wheel 35.
This hour wheel 17 rotates integrally with the hour hand 37 at a speed of 1/12 r.ph, and as a result, the time at each point in time is sequentially indicated via the second hand 39, minute hand 38, and hour hand 37. be.

On the other hand, the switching correction mechanism 5, as shown in detail in FIG.
and a switch lever 46. The winding stem 40 is slidably and rotatably provided on the main plate 2, and a ratchet wheel 41 is fitted in the middle of the winding stem 40. The ratchet wheel 41 is held slidably in the axial direction of the winding stem 40 by a spline connection or the like, and rotates integrally with the winding stem 40 when the winding stem 40 rotates. The small iron car 42 meshes with the sun wheel 35, and this small iron car 4
2, the above-mentioned screw wheel 41 engages with the screw wheel 41 in a detachable manner according to its sliding. The mandarin duck 43 is rotatably supported via a pin 47, and the engaging portion 48
and a pressing portion 49 are integrally formed, and the engaging portion 48 engages with a stepped portion 50 of the winding stem 40.
The cannula 44 is rotatably supported via a pin 51 and integrally includes an engaging portion 52 and a contact lever 53, and the engaging portion 52 is connected to the stepped portion 54 of the wheel 41.
is engaged in. An interlocking pin 55 is attached to the mandarin duck 43, and this interlocking pin 55 engages with an L-shaped guide groove 56 formed in the canopy 44. Therefore, when the winding stem 40 is pulled out in the projecting direction, the mandarin duck 43 rotates clockwise in the figure (hereinafter the same) using the pin 47 as a fulcrum, and the interlocking pin 55 moves along the guide groove 56. be.

The stop lever 45 integrally extends from the back presser 60 in the shape of a leaf spring, and as shown in detail in FIG. The base end side is a release part 62, the distal end side is a sliding part 63, and a stop part 64 bent at a right angle is formed at the distal end of the sliding part 63. The pressing part 49 of the mandarin duck 43 is disposed to face the middle part of the stop lever 46, and the pressing part 49 moves from the release part 62 over the stepped part 61 in accordance with the rotation of the mandarin duck 43 to the sliding contact part 63. This transition causes the stop lever 45 to elastically bend and the stop portion 64 to descend. The tip of this stop portion 64 faces the upper surface of the intermediate wheel 28. As shown in detail in FIGS. 1 and 2, on the upper surface of the intermediate wheel 28, convex portions 65 are provided on a concentric circle corresponding to the stop portion 64.
... are formed protrudingly at regular intervals. These convex portions 65... are formed to have a mountain-shaped cross section, for example, as shown in FIG. Further, a positioning lever 66 integrally extends from the back presser 60, and the side edge of the positioning lever 66 has a wave shape that elastically contacts the interlocking pin 55 of the mandarin duck 43 to hold the winding stem 40 in a predetermined position. positioning part 67
is formed.

The switch lever 46 is rotatably supported via a pin 70, has an operation piece 71 in the middle part, contact parts 72a and 72b on both sides, and has a bent piece on the tip edge of the operation piece 71. 74 is formed. As shown in FIG. 9, the intermediate portion of the winding stem 40 is formed as an operating section 75 having a rectangular cross section, and a bending piece 74 of the switch lever 46 faces one side of the operating section 75. .

On the other hand, as shown in FIG. 5, the main plate 2 has a liquid crystal display element 80 in a part thereof, a circuit board 81 covering almost the entire bottom surface, and an insulating sheet 82 interposed between the circuit board 81 and the circuit board 81. A metal reinforcing member 83 that also serves as a conductive member is provided so as to cover both sides. Then, on the circuit board 81, electrodes 84a, 84b and 85a for the liquid crystal display element 80,
85b are provided respectively, and the electrodes 84a, 84b
The tip of the contact lever 53 formed on the cannula 44 is located at the location where the electrodes 85a and 85b are located, and the contact portion 72 formed on the switch lever 46 is located at the location where the electrodes 85a and 85b are located.
The tips of a and 72b are facing each other.

Next, the operation of the movement 1 configured as described above will be described.

A reversing pulse is supplied to the coil 8 of the step motor 3 every second, and the rotor 10 rotates in steps every second. In normal operation, that is, when the winding stem 40 is in the position shown in FIG. 7a, The operation of the rotor 10 is transmitted to the second hand 39, minute hand 38, and hour hand 37 via the wheel train mechanism 4, and the time at each point in time is sequentially indicated by an analog display.

From this state, as shown in FIG. 44 rotates clockwise, and this cannula 44
As the contact lever 53 rotates, the contact lever 53 comes into contact with the electrode 84a, and this contact switches the digital display on the liquid crystal display element 80 from, for example, a normal mode to a correction mode. When the winding stem 40 is rotated in the forward and reverse directions in this position, the winding stem 40
The operating part 75 and the bending piece 74 of the switch lever 46
When the switch lever 46 comes into contact with the
By touching 85b alternately, the displayed mode value can be increased or decreased to set it to a predetermined value.

When the winding stem 40 is further pulled out and set in the position shown in FIG. do. Then, as the mandarin duck 43 rotates clockwise, the pressing part 49 of the mandarin duck 43 moves from the release part 62 of the stop lever 45 over the inclined step part 61 to the sliding contact part 63, and this transition causes the stop lever 45 to move. The stop portion 64 is elastically bent and lowered, and its tip enters and abuts against the side surface of one of the convex portions 65 of the intermediate wheel 28, and this abutting engagement prevents the rotation of the intermediate wheel 28. It resists the driving force and stops. Further, due to the counterclockwise rotation of the cannula 44, the locking wheel 41 slides rightward from the state shown in FIG. 10a and meshes with the small iron wheel 42, as shown in FIG. Further, by rotating the cannula 44 counterclockwise, the contact lever 53
contacts the other electrode 84b, and this contact opens the circuit between the electrodes 85a and 85b.

In this state, when the winding stem 40 is rotated, this movement is transmitted from the tsuzumi wheel 41 through the small iron wheel 42 to the day wheel 35, and further from the day wheel 35 to the second pinion of the center wheel 20. 22 and the hour wheel 17, and therefore the minute hand 38 and hour hand 37 can be set with the second hand 39 stopped. When the second pinion 22 rotates, the second pinion 22 is rotated based on the slip mechanism 23.
2 rotates while slipping against the second gear 21. Also, when the winding stem 40 rotates, the winding stem 40
0 operating section 75 is the bending piece 7 of the switch lever 46
However, as the rotation of the winding stem 40 progresses further, the edge of the operating part 75 passes over the bending piece 74, and therefore the rotation of the winding stem 40 continues without any hindrance. In addition, the folded piece 7
The switch lever 46 rotates due to the contact of the operating part 75 with the electrode 8, and the contact parts 72a and 72b
However, since the circuit of these electrodes 85a and 85b is open as described above, the digital display will not be affected in any way.

After the minute hand 38 and hour hand 37 have been set in this way, the winding stem 40 is pushed in and set in the position. By this operation, the tip of the stop lever 45 is aligned with the convex portion 65 of the intermediate wheel 28.
The rotation restriction on the intermediate wheel 28 is released, and the Tsuzumi wheel 41 is separated from the side surface of the small iron wheel 42.
The second hand 39 is disengaged from the rotor 10, and the second hand 39 starts rotating again in conjunction with the rotor 10. Note that each position of the winding stem 40 can be accurately switched by a click-stop operation based on the elastic contact between the interlocking pin 55 of the mandarin duck 43 and the positioning portion 67 of the positioning lever 66, and each position can be accurately changed. can be retained.

By the way, as for the number of convex parts 65 provided on the intermediate wheel 28, the number of teeth of the intermediate gear 36 of the intermediate wheel 28 is Zn, and the number of teeth of the intermediate gear 36 of the intermediate wheel 28 is Zn.
When the number of teeth of the rotor pinion 12 is Z, (2×
Zn)/Z may be used. Further, the shape of the convex portion 65 can be modified in various ways, such as having a semicircular cross section, as shown in FIG.
Furthermore, this invention is not limited to the case where the rotation is restricted by the convex part 65. As shown in FIG. It is also possible to insert the tip of the stop lever 45 into the stop lever 45 and abut against and engage with the side surface thereof, and to restrict the rotation of the intermediate wheel 28 by such abutting and engaging. In addition to the intermediate wheel 28, it is also possible to select other gears of the wheel train mechanism 4 as the target gear whose rotation is to be restricted.

[Effect of idea]

As explained above, according to this invention, a stop lever is provided that is movable along the axial direction of the gear of the gear train mechanism, a convex portion or a recess is formed on the gear corresponding to the stop lever, and the stop lever is moved. Since the rotation of the gear is restricted by bringing the tip into contact with the side surface of the convex or concave portion, even if the gear is made of plastic, the tips of the teeth will not be deformed or damaged. The rotation of the stop lever can be accurately regulated and stopped at all times, and since the stop lever simply moves in the axial direction of the gear and comes into contact with the side surface of the protrusion or recess, the rotation axis of the stop lever The number of parts can be reduced by eliminating the need for the stop lever, and there is no need for a large space for moving the stop lever, making assembly easy and making the wheel train mechanism compact. Since no load is applied to the shaft, deflection of the shaft can be reliably prevented and smooth rotation transmission operation can be performed at all times. Further, since the stop lever is moved in the axial direction only when regulating a predetermined gear, there is no deterioration in the elastic force of the stop lever, resulting in excellent durability.

[Brief explanation of the drawing]

Figures 1 to 10 show an embodiment of this invention, with Figure 1 being a side view of the main parts, Figure 2 being a plan view, and Figure 3 being a sectional view taken along the - line in Figure 2. , Fig. 4 is a bottom view of the wristwatch movement, Fig. 5 is a bottom view of the movement with the circuit board and reinforcing material attached to the bottom side, Fig. 6 is a sectional view of the gear train mechanism, and Fig. 7 is a bottom view of the movement. FIG. 8 is a side view of the stop lever arrangement, FIG. 9 is an explanatory diagram showing the operational relationship between the winding stem and the switch lever, and FIG. 10 is a diagram showing the relationship between the winding stem and the gear train mechanism. 11 is a sectional view showing a modified example of the convex portion, and FIG. 12 is a sectional view showing another embodiment of this invention. 4... Wheel train mechanism, 28... Intermediate wheel (gear), 4
5...Stop lever, 65...Protrusion, 65a...
...concavity.

Claims (1)

[Scope of Claim for Utility Model Registration] A gear train mechanism consisting of a plurality of gears supported by a main plate and a bridge that transmits the rotation of a motor to a pointer to move the pointer; a winding stem that can be pulled out in the vertical direction; a rotating member that is attached to the main plate and rotates in parallel to the surface of the main plate in conjunction with the movement of the winding stem; and a rotating member that is attached to the receiving side of the main plate that rotates the winding stem. a stop lever that moves in the axial direction of the gear of the gear train mechanism in conjunction with the rotation of the moving member, and the stop lever includes a fixed part fixed to the base plate and a predetermined distance from the fixed part from the surface of the base plate. an open part formed to extend from the open part; a step part bent from the tip of the open part toward the ground plate surface; and a sliding contact part formed to extend from the tip of the stepped part along the ground plate surface; A stop part is formed by bending the sliding contact part toward the receiving direction side, and the front end faces a predetermined gear among the plurality of gears, and the stop part of the gear train mechanism faces the front end of the stop part of the stop lever. A convex portion or a concave portion is formed on one side of the predetermined gear facing the stop portion end, and one end of the rotating member is located between the open portion and the base plate when the winding stem is in a normal position. When the winding stem is pulled out, one end of the rotating member climbs over the stepped portion and is inserted between the sliding contact portion and the main plate, thereby causing the sliding contact portion of the stop lever to move toward the predetermined gear. A rotation regulating device for a wheel train mechanism, characterized in that the stop portion is moved so that the tip of the stop portion comes into contact with a side surface of a convex portion or a concave portion of the predetermined gear, thereby regulating rotation of the predetermined gear.